You'll have to do a little modification, but you can mount and use a standard rear rack to set up a delta trike for load4d touring.

Parts:
  1. 2 shackle bolts
  2. 1 Avenir Rear Rack
  3. 2 grade 8 bolts to mount down struts to lower mount points / nuts and lock washers


Mount the shackle bolts on the middle crossbar, mount the down struts at the lower basket mounts on an EZ-3 trike (You will likely have to spread them a bit). Mount the forward rack mounts to the shackle bolts Bending is required).

See below:





It actually turned out looking like it was purpose built unless you look at the sloppy bends on the forward mounts